F. Børgesen: Rhodophyceæ of the Danish W. Indies. 113 



with the original specimen from Madagascar and sent to Kjell- 

 MAN from E. BoRNET under the name of G. marginata. Both plants 

 grow in dense tufts. 



But my plant is not so much incrusted with chalk, the thallus 

 is thinner, the internodes are less broad at their base. Further 

 G. vepreciila differs from my species by having an entirely dull 

 surface and by being more light yellow-green with a reddish tinge. 

 To judge from Kjellman's description and figures the anatomical 

 structure seems to come very near in both plants; but the pa- 

 pillæ in my plant are longer and relatively more slender than 

 those in Kjellman's plant which besides have also often a round- 

 ish apex. 



And G. infirma Kjellman from Sandwhich Island which has 

 also the internodes somewhat narrowed differs from my plant in 

 its thicker, dull, not shining and rather rugose thallus and by 

 the different form of the papillæ. However, the original speci- 

 mens are some small fragments and a comparison is therefore 

 difficult. 



The two other species, Galaxaura hystrix Kjellm. and Galax- 

 aura ventricosa Kjellm. seem to show more differences. 



In a paper: "Notes on the species of Liagora and Galaxaura 

 of the Central Pacific"^) F. K. Butters has described a Galaxaura 

 spec, which seems to come very near to my plant; but to judge 

 from the very short description some minor differences are present : 

 the Pacific plant seems to be more distinctly contracted and 

 jointed at the base of the internodes and the size and shape of 

 the papillæ also show some differences. 



Galaxaura occidentalis I have found only once in shallow 

 water and in sheltered place; in the collections of algæ in the 

 Botanical Museum, Copenhagen, two old specimens are found, 

 one from St, Croix and another with the indication "Antillis 

 1836". 



St. Croix: The harbour of Christiansted. 



1) In "Minnesota Botanical Studies", Vol. IV, part II, Minneapolis 1911, 

 p. 183. 



Dansk Botanisk Arkiv, Bd. 3. Nr. 1. (1916.1 8 



